Windows Update installed KB4489868 overnight and now screen fonts have changed and there are severe rendering issues making some text unreadable. I have reset the Font Cache and turned off Clear Type but the problem remains.
2. If the issue has been caused due to recent Windows update - I would suggest that you uninstall the latest KB update and hide it so that it doesn't install it automatically and wait for new update to come which will be installed automatically.
To know which update got installed
Windows Key+i to invoke Settings > Update & Security > Click View installed update history. These KBs should be from the below list. Don't uninstall any other KB
For 1809 -
For 1803 -
Make note of KB and uninstall and block it.
Windows Key + R > Type: appwiz.cpl > Enter > Click View installed updates > Select the required updates, right click, uninstall.
Microsoft has provided a tool Show/Hide Updates tool to block the update
Download the tool from below link http://download.microsoft.com/download/f/2/2/f2...
When you run this troubleshooter, it will search for available updates and list them
Select the update which you want to hide. Click Next and follow on-screen directions
Do let me know if you require any further help on this. Will be glad to help you.